源程序：

#include <iostream>

using namespace std;
class Point {
public:
Point(int x = 0, int y = 0) :x(x), y(y)
{
count++;
}
Point(Point&p) {
x = p.x;
y = p.y;
count++;
}
~Point()
{
count--;
}
int getX()
{
return x;
}
int getY()
{
return y;
}
void showCount()
{
cout << "Object count=" << count << endl;
}
private:
int x, y;
static int count;
};
int Point::count = 0;
int main()
{
Point a(4, 5);
cout << "Point A:" << a.getX() << "," << a.getY() << endl;
a.showCount();
Point b(a);
cout << "Point B:" << b.getX() << "," << b.getY() << endl;
b.showCount();
system("pause");
return 1;
}

运行结果：